Looking for a children’s book about 2 pigs on a farm who feel like they are missing out on something. They clean themselves up and go out into the world. However nothing is as they thought it would be so they head back to the farm to their nice mud hole again.
Could it be Small Pig by Arnold Lobel? Only one pig, but otherwise it’s as you describe. The pig leaves because the farmer’s very tidy wife cleans up his mud wallow.